Fitness platform



FIG. 1 is a perspective view of a fitness platform embodying my design;

FIG. 2 is a front elevational view thereof, which is identical to a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof, which is identical to a right side elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a fitness platform, as shown and described. 